ac power-supply LEDs

Use this information to view ac power-supply LEDs.

The following minimum configuration is required for the dc LED on the power supply to be lit:

Power supply
Power cord

Note

You must turn on the server for the dc LED on the power supply to be lit.

The following illustration shows the locations of the power-supply LEDs on the ac power supply.

Figure 1. ac power-supply LEDs

The following table describes the problems that are indicated by various combinations of the power-supply LEDs on an ac power supply and suggested actions to correct the detected problems.

ac power-supply LEDs			Description	Action	Notes
ac	dc	Error (!)	Description	Action	Notes
On	On / Blinking	Off	Normal operation.
On	Blinking	Off	Zero Output mode		The zero output mode is used to configure the power supply behavior as standard redundant mode or zero-output mode by the host system. When the power supply is configured to this mode, minimal power consumption is maintained. At the same time, the power supply will keep its fan rotating, and the PSU LED should blink at a rate of 1 Hz.
Off	Off	Off	No ac power to the server or a problem with the ac power source.	Ensure that the ac power source meets the minimum voltage requirement for the installed power supplies. Ensure that the power cord is connected to a functioning power source. Restart the server. If the error remains, check the power-supply LEDs. If the problem remains, replace the power-supply.	This is a normal condition when no ac power is present.
Off	Off	On	The power supply has failed.	Replace the power supply.
Off	On / Blinking	Off	The power supply has failed.	Replace the power supply.
Off	On / Blinking	On	The power supply has failed.	Replace the power supply.
On	Off	Off	Power-supply not fully seated, faulty system board, or the power supply has failed.	Reseat the power supply. Use the Power Configurator utility to ensure that current system power consumption is under limitation. For more information and to download the utility, go to https://support.lenovo.com/solutions/lnvo-pwrconf.	Typically indicates a power-supply is not fully seated.
On	Off	On	The power supply has failed.	Replace the power supply.
On	On / Blinking	On	The power supply has failed.	Replace the power supply.

Note

When the dc LED is blinking at a 1 Hz rate, the PSU is at STANDBY mode. That is, no dc power output is from this PSU.

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